This paper explores issues of reflexivity and knowledge production when cisgender researchers conduct social work research, using feminist narrative methods, to advance understanding about trans and non-binary people's identities and experiences. Cisgender (or 'cis') refers to people who identify with the gender identity assigned to them at birth. The paper examines cis identity, privilege and positionality arguing for a reflexive engagement of the ways in which these influence ethical decision-making and research praxis. In this way, we speak to existing critiques that suggest that only trans and non-binary people should research their own experiences and identities. To address the neglect of gender diversity in education for social work practice and research, we propose that doing social work research with trans and non-binary communities requires cis researchers to adopt critical ethical reflexivity (CER) to scrutinise the impact of gender normativity and its effects in knowledge production for social work.